[j-nsp] Next-table, route leaking, etc.

Nathan Ward juniper-nsp at daork.net
Sun Feb 9 22:07:37 EST 2020

Hi all,

Something that’s always bugged me about JunOS, is when you import a route from another VRF on JunOS, the attributes follow it - i.e. if it is a discard route, you get a discard route imported.
(Maybe this happens on other platforms, I honestly can’t remember, it’s been a while..)

This is an issue where you have a VRF with say a full table in it, and want to generate a default discard for other VRFs to import if they want internet access. Works great if the VRF importing it is on a different PE, but, if it’s local it simply gets a discard route, so packets get dropped rather than doing a second lookup.

You can solve this, sort of, with a next-table route, but things can get a little messy, so hoping for something more elegant.

I’m trying to figure out if there’s a better way to do this, i.e. to make it as though packets following leaked routes behave as though they are from a different router.

Anyone got any magic tricks I’ve somehow missed?

Nathan Ward

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